arch/um/drivers/virt-pci.c:537:21: warning: no previous prototype for 'pcibios_get_phb_of_node'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1639fae5132bc8a904af28d97cea0bedb3af802e
commit: 314a1408b79a844dafdcde867d90de5d509409b7 um: virt-pci: implement pcibios_get_phb_of_node()
date:   4 months ago
config: um-randconfig-r026-20230617 (https://download.01.org/0day-ci/archive/20230617/202306171053.SOGnteNi-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230617/202306171053.SOGnteNi-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306171053.SOGnteNi-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> arch/um/drivers/virt-pci.c:537:21: warning: no previous prototype for 'pcibios_get_phb_of_node' [-Wmissing-prototypes]
     537 | struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
         |                     ^~~~~~~~~~~~~~~~~~~~~~~


vim +/pcibios_get_phb_of_node +537 arch/um/drivers/virt-pci.c

   535	
   536	/* Copied from arch/x86/kernel/devicetree.c */
 > 537	struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
   538	{
   539		struct device_node *np;
   540	
   541		for_each_node_by_type(np, "pci") {
   542			const void *prop;
   543			unsigned int bus_min;
   544	
   545			prop = of_get_property(np, "bus-range", NULL);
   546			if (!prop)
   547				continue;
   548			bus_min = be32_to_cpup(prop);
   549			if (bus->number == bus_min)
   550				return np;
   551		}
   552		return NULL;
   553	}
   554	

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